Dovetailing-machine.



3 SHEETS-8HEET 1.

Patented Feb. 17, 1914.

Z31 van ibr- G. A. RAULF. DOVETAILING MACHINE.

APPLICATION FILED 31mm, 1912.

wi'inesnefl M, Jar/Jim fling.

CDLUMBlA PLANOGRAPH (20.. WASHINGTON, Dv c.

G. A. RAULP. DOVETAILING MACHINE. APPLICATION FILED A-UG.19, 1912,

1,087,460. A Patented Feb. 17, 1914.

3 SHEETS-SHEET 2.

c. A. RAULF. DOVETAILING MACHINE.

APPLICATION FILED AUG. 19, 1912.

Patented Feb. 17, 1914.

3 SHEETS-SHEET 3.

HINEITON, D :4

UNITED STATES PATENT OFFICE.

CARL A. RAULF, OF CHICAGO, ILLINOIS, ASSIGNOR T0 RAULF MANUFACTURINGCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DOVETAILING-MACHINE.

Specification of Letters Patent.

Patented Feb. 1'7, 1914.

Application filed August 19, 1912. Serial No. 715,910.

To all whom it may concern:

I Be it known that I, CARL A. RAULF, a cit zen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Dovetailing-Machines, of whichthe following is a specification.

The objectof myinvention is to produce a simple, cheap and effectivemachine operable by one person, by which not only the ordinary dovetailtongue and groove can be made, but that can be adjusted to make agradual tapering dovetail tongue and groove whereby the matched partscan be wedged together; a machine which can be adjusted to make variousdegrees of taper in any sized dovetail tongue and groove.

The manner in which I accomplish my object is described in the followingspecification and illustrated in the accompanylng drawings in whichFigure l is a side elevation. The right end of part ofthe frame beingbroken away. Fig. 2, is an end elevation on the line 22 Fig. 1, theparts broken away in Fig. 1 being in section. Fig. 3 is a left endelevation of one end of the traveling carriageand part of the framebeing in section. Fig. 4 is a vertical sectional elevation on the line44 Fig. 1. Fig. 5, is a fragmental sectional side elevation of partsshown in Fig. 4. Fig. 6 is a side elevation of part of the driving andthe belt shifting mechanism. Fig. 7, is a vertical sectional elevationon the line 77 Fig. 6. Fig. 8 is an end elevation of one of the beltshifting handles, the rod being in section and the dotted linesindicating the relative operative positions. F1g. 9 is a top plan of thecarriage adjusted for a tapering wedge shaped dovetail tongue or groove.Fig. 10 indicates the wedge shape.

of the tongue, that is out when the carriage is set as shown in Fig. 9.Fig. 11, is a top plan of the parts shown in Fig. 9, adjusted for a onesided wedge shape, shown in Fig. 12. Fig. 13 is a section on the line1313 Fig. 1. p

In the drawings 14 indicates the main frames which are shown in sideelevation in Fig. 1, and in end elevation in Fig. 2. These frames arejoined by a plate 15 shown in Figs. 2, 6, and 7. Forming part of theframes are vertical parallel walls 16. Extending through these walls arevertical slots 17 Movable vertically between the walls 16,

on the side of each of the'frames 14 is a frame 18 which is adjustablysecured by screw bolts 19, which extend'through the slots 17. Thevertical movement of each of the frames 18, is made by hand screws 20,.

which are rotatably supported in bearings 21 forming part of the frames14. In the top of each of the frames 18, are transverse channels 22, thewalls of these channels are undercut. Supported in these channels areshaft bearings 23, which 'alsoform a trans-" verse brace between theframes 14. Rotatably supported in the bearings 23, is a cutter spindle24, which is provided with a central pulley 25. Both ends of thisspindle are threaded, and provided with nuts 26, and sleeves 27 by whichthe cutters 28 are secured in position on the spindle. Centrally locatedbetween the side frames 14, is a bearing standard 29. Rotatablysupported in this bearing 29, and in the bearings 30 in the frames 14,are shafts 31. Fixed on these shafts are gears 32. On each of theseshafts are three pulley wheels 33, the center pulley wheel being fixed,and the outside. pulleys are loose. Rotatably supported in bearings 34secured on a rear extension of the frames 14, is a driving shaft 35. Onthis shaft is a drum 36, and a driving wheel 37. Connecting the drum 36and the pulleys 33 are four belts 38. Two of these belts are straight,and two are crossed as shown in Figs. 1 and 7. Pivotally and slidablysupported on the cross frame 15 are belt shifting rods 39 and 39*. Fixedon these rods are belt shifting forks 40 in position to engage thebelts-38. Pivotally connected to these rods 39 and 39*, and to the crossplate 15 are two levers 41, and 41 by which the rods 39 and 39 areoperated. In the upper end of each of these levers is a vertical slot42. Slidably engaged in these slots are crank pins 43 fixed in a .crank44. Each is fixed on a rod 45. These rods are supported in bearings 46and operated by the handles 47 by which means the belts are shifted fromthe loose tothe tight pulleys, and the shafts 31 and gears 32 arethereby rotated, and reversed.

In mesh with the gears 32 are gears 48 and 49. These gears are fixed onthe shafts 50 and 51. wheels 52 and 53. Coiled around the wheels 52 and53 are cables 54. These cables pass over grooved wheels 55 which arerotatably On these shafts are grooved supported in brackets 56 securedon each end of the machine. These brackets are fixed on the ends ofparallel I beams 57, which are slidably secured in channel bars 58 whichare supported on the frames 14. These I beams are in two parts, the endsbutting together at the point indicated by 57" shown in Figs. 1 and 6.Fixed on each side of each I beam close under the top head 57 are anglebars 59. Slidably supported on the head 57 of each I beam, and on theangle bars 59, is a block 60. Secured on this block is a carriageconsisting of two main members 61 and 62. These parts are adjustablyconnected together by the screws 63 and 64, links 65, and screws 66.Rotatably supported in bearing projections of the block 60 indicated bydotted lines in Fig. 4: is a shaft 67. On one end of this shaft is aratchet wheel 68, this ratchet is engaged by a pawl 69 which is securedto the end of that side of the carriage indicated by 62. Pivotallysecured to the face of this ratchet wheel 68 are two links 70. Fixed onthe opposite end of each of the shafts 67 is a disk 71. Pivotallysecured on these disks are links 72. Adjustably attached to the linksare clamps 73. These clamps are connected by rods 74. Adjustably securedon each side of the I beam 57 at the left half are gage plates 75. Theseplates are adjustable vertically by screws 76, and secured to the I beamby the hand screws 77 which extend through the I beam. These gage platesare adapted to support the material 78 on the carriages while they arebeing secured by the clamps 73 as hereinafter explained.

WVhen the several parts of the machine are constructed as described andillustrated and assembled together, their use and operation is asfollows: Motive power from any suitable source being applied bytransmission to the spindle pulley 25 and to the driving pulley 37 g thebelts 38 being held on the loose outside pulleys 33 by the belt shiftingmechanism the handles 47 being then in the intermediate position shownby the solid lines 47 and the levers 41 and ll in the positions shown inFigs. 2 and 7. The carriages are then adjusted by the screws 64, links65, and screws 66, as illustrated in Figs. 9 and 11 to produce the tapercut desired on the material. The handles 67 are then'placed in theposition shown by the dotted lines in Fig. 3. The material 78 is thenplaced between the sides of the carriages and the clamps 73, the bottomedges resting on the gage plates 75. These plates are then adjusted sothat the depth may be, as desired. The handles 67 a are then turned tothe right to the position shown by solid lines in Figs. 1 and 3 wherebythe shafts 67, ratchets 68, disks 71, links 10 and 72 are actuated andthe clamps 73 drawn against the material,

and the material thereby pressed against the carriages and locked by thepawl 69. One of the handles 47 is then turned to the position shown bythe dotted lines 47* in Fig. 8 and one of the belts 38 thereby shiftedon to the tight pulley, whereby the gears 32, 48, wheel 52 and cable 54are actuated; the carriage and material thereby drawn over the cutters28; and one side of each piece of material is cut. The movement of thehandle L7 to the position shown by the dotted lines 47 in Fig. 8, shiftsthe belts and the reverse movement of the gears, pulley, and cable movesthe carriage back to the first position where the handle 47 is movedback to the position 47 and the belts thereby run on to the loosepulleys. During the travel of the first carriage, material is placed onthe other carriage and is clamped and the carriage started as beforeexplained, while the first carriage is going and returning.

While the second carriage is traveling the material on the firstcarriage is reversed clamped and the carriage is again started while thesecond carriage is returning. The shifting of thebelts can'be eitherperformed by the hand of the operator or by dogs which can be adjustedon the machine to move the shifters as desired. To place the cutters onor to remove them from the spin dle the I beams are drawn apart, andthen readjusted.

In Figs. 9 and llthe longitudinal sections ofthe carriage are shown inspaced relation to each other, and the outer edges of the carriage areshown out of parallel relation to each other. This arrangement causesthe carriage to cross the cutters and arbor at right angles, and thematerial to be cut to cross-the cutters obliquely.

What I claimis 1. In combination, a cutter, a track for guiding work tothe cutter, and acarriage having its sides inclined from a verticalplane for supporting work on the track and having its sides disposed outof parallelism with each other 'longitudinally'of the track, and meansfor holding the work to the inclined sides of the carriage.

2. In combination, a cutter, a track for guiding work to the cutter, anda work supporting carriage having its sides inclined pose the outersides of the carriage out of parallelism With each other longitudinallyof the track, and means for holding the Work to the inclined sides ofthe carriage.

4. In a machine of the kind described, the combination with a mainframe, a traveling carriage supported thereon having separate obliquesides, means for adjusting said sides toward and away from each other,and means for clamplng and locking material on said sides to be tonguedand grooved; of

means adjustably supported on said frame for regulating the verticalposition of material placed on said sides whereby the depth of thetongues and grooves to be cut therein can be determined as described.

5. In a machine of the ln'nd described, the

combination With a main frame; of a plurality of traveling carriagessupported thereon and movable in parallel lines, each of said carriageshaving separate oblique sides for holding material to be tongued andgrooved, means for adjusting the sides of each carriage in relation. toeach other and to the line of travel. of the carriage, means forclamping and locking material on said sides of each of said carriages,and means for adjusting the vertical position of said material on saidsides as described.

CARL A. RAULF.

Witnesses THoMAsJ. MORGAN, GUSTAVEY T. FRAENCKEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

